package homework.api.day12;

import java.io.*;
import java.net.ServerSocket;
import java.net.Socket;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.List;

public class Server {

    private ServerSocket serverSocket;
    private List<PrintWriter> allOut = new ArrayList<>();

    public Server(){
        try {
            System.out.println("启动服务器...");
            serverSocket = new ServerSocket(8088);
            System.out.println("启动服务器完成");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public void start(){
        try {
            while(true){
                //执行主线程，开始一直接听
                System.out.println("等待接听客户端");
                Socket socket = serverSocket.accept();
                System.out.println("接入一个客户端");

                Runnable handler = new ClientHandler(socket);
                Thread t = new Thread(handler);
                t.start();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        Server server = new Server();
        server.start();
    }

    private class ClientHandler implements Runnable{
        private Socket socket;
        private String host;

        public ClientHandler(Socket socket){
            this.socket = socket;
            host = this.socket.getInetAddress().getHostAddress();
        }

        public void run(){
            PrintWriter pw = null;
            try {
                InputStream in = socket.getInputStream();
                InputStreamReader isr = new InputStreamReader(in, StandardCharsets.UTF_8);
                BufferedReader br = new BufferedReader(isr);

                OutputStream out = socket.getOutputStream();
                OutputStreamWriter osw = new OutputStreamWriter(out,StandardCharsets.UTF_8);
                BufferedWriter bw = new BufferedWriter(osw);
                pw = new PrintWriter(bw,true);

                synchronized (allOut){
                    allOut.add(pw);
                }
                sendMessage(host+"上线了，上线人数："+allOut.size());

                String message;
                while((message=br.readLine())!=null){
                    sendMessage(host+"说："+message);
                }

            } catch (IOException e) {
                e.printStackTrace();
            }finally {
                synchronized (allOut) {
                    allOut.remove(pw);
                }
                sendMessage(host+"下线了，上线人数："+allOut.size());

                try {
                    socket.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }

        public void sendMessage(String message){
            System.out.println(message);
            synchronized (allOut) {
                for (PrintWriter p : allOut) {
                    p.println(message);
                }
            }
        }

    }
}
